Final1stspy obfuscates strings with base64 encoding.2
tool
Final1stspy S0355
- Type
- malware
- Platform
- Windows
- Created
- 31 January 2019
- Last modified
- 25 April 2025
Final1stspy is a dropper family that has been used to deliver DOGCALL.[1]
6
Techniques29th pct
5
Tactics41st pct
1
Threat groupunranked
0
CampaignsNone recorded
Enterprise ATT&CK only. Any Mobile or ICS rows on the same ATT&CK page are not carried.
MITRE reference S0355
Final1stspy obtains a list of running processes.3
Final1stspy uses HTTP for C2.4
Final1stspy obtains victim Microsoft Windows version information and CPU architecture.5
Final1stspy uses Python code to deobfuscate base64-encoded strings.6
Final1stspy creates a Registry Run key to establish persistence.7
Standing S0355
Reach is how much of ATT&CK this tool touches. Coverage is how well defended each thing it does is, as a median per technique rather than a total — a total would just restate the reach. Each figure is ranked against all 825 ATT&CK software entries only where that population actually spreads. Where most of the population shares one value, a percentile would rank the tie instead of the entity, so the raw value is shown and no rank is claimed.
Reach
Techniques629th pct
29th percentile · 71% of 825 ATT&CK software entries have more Enterprise techniques.
Tactics541st pct
41st percentile · 59% of 825 ATT&CK software entries have more tactics spanned.
Threat group161% tie · 22 values
61% of the population shares a single value across only 22 distinct values, so a percentile here would rank the tie, not the entity.
Campaigns085% tie · 8 values
85% of the population shares a single value across only 8 distinct values, so a percentile here would rank the tie, not the entity.
Coverage
Rules / technique50medTop 8%
92nd percentile · 92% of 825 ATT&CK software entries have this many detection rules per technique or fewer.
Tests / technique11med
Detection coverage S0355
294 distinct rules cover the 6 techniques recorded for this tool. The 303 technique-to-rule mappings resolve to 294 distinct rules, because one rule can cover several techniques. 241 Sigma · 53 Splunk.
6 covered by at least one rule294 distinct rules in total
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